{"id":"CVE-2026-105483","title":"A flaw in Node.js TLS hostname verification allows a certificate without a matching IP address SAN to authenticate a connection to an IPv4 address when the host is written with non-ASCII characters, such as fullwidth digits (`１２７.0.0.1`)…","summary":"A flaw in Node.js TLS hostname verification allows a certificate without a matching IP address SAN to authenticate a connection to an IPv4 address when the host is written with non-ASCII characters, such as fullwidth digits (`１２７.0.0.1`)…","severity":"high","cvss":7.4,"cvssVector":"CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N","cvssSource":"cna","cwe":["CWE-295"],"vendor":"nodejs","product":"node","affected":["node >= 24.22.0 <= 24.22.0","node >= 26.12.0 <= 26.12.0"],"published":"2026-10-23","updated":"2026-10-23","sourceUpdated":"2026-10-23T16:15:05.773Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-105483","references":[{"url":"https://nodejs.org/en/blog/vulnerability/october-2026-security-releases"}],"tags":["cve.org"],"ingestedAt":"2026-10-23T16:31:11.320Z","slug":"CVE-2026-105483","body":"## Overview\n\nA flaw in Node.js TLS hostname verification allows a certificate without a matching IP address SAN to authenticate a connection to an IPv4 address when the host is written with non-ASCII characters, such as fullwidth digits (`１２７.0.0.1`).\n\n`tls.checkServerIdentity()` did not recognize such hosts as IP addresses, even though they normalize and resolve to a regular IPv4 address, and matched them against the certificate DNS names and Common Name instead. A certificate containing `DNS:127.0.0.1` or `DNS:*.0.0.1` could therefore be accepted for an IP endpoint it was not issued for. This is a regression introduced after the fix for CVE-2026-48618.\n\nThis vulnerability affects Node.js **26.x** and **24.x**.\n\n## Affected\n\n- `node >= 24.22.0 <= 24.22.0`\n- `node >= 26.12.0 <= 26.12.0`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":41,"depthScoreParts":{"impact":40.7,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}